JP3798790B2 - Road surface cutter - Google Patents

Description

  The present invention relates to a road surface cutter that can be used when cutting a road surface such as asphalt or concrete at various construction sites (road work, waterworks, construction work, civil engineering work, etc.).

  Conventionally, a road surface cutter has been used in road surface cutting work performed in road construction or the like. As this type of road surface cutter, an engine is mounted on a moving carriage, and a substantially circular blade is connected to the engine so that it can rotate and move up and down. In some cases, the road surface is cut by rotating and lowering the blade to enter the road surface in this state.

For example, Patent Document 1 discloses a technology for protecting a blade by mounting an engine as a driving source, transmitting the driving force of the engine to a circular blade, and mounting a cover case covering the upper half of the blade. It has been proposed (see Patent Document 1).
JP 2002-513683 A

  However, since the conventional road surface cutter has a configuration in which the upper half of the blade is simply covered with a cover, the cutting sound of the blade and the driving sound of the engine are directly emitted to the surroundings when performing the road surface cutting process. . For this reason, there is a problem in that it may cause discomfort and annoyance to the operator who performs the cutting process and surrounding people.

  In addition, dust generated by the road surface cutting process is scattered around, which places a burden on the cleaning process and may reduce the durability of the engine if it is sucked into the intake pipe of the engine, thereby impairing reliability. There is a problem that there is.

  The present invention has been made in order to solve the above-described problems, and can reduce the noise generated when performing the cutting process to enhance the comfort and reduce the burden of the cleaning process and improve the convenience. It aims at providing the cutter for road surfaces which can improve.

The invention according to claim 1 is a blade that can cut a road surface, an engine that is a driving source, a driving force transmission means that transmits the driving force of the engine to the blade, and the blade that can enter and leave the road surface. And a case surrounding the blade. The case includes a main body having an opening at the bottom, and a brush extending downward from the main body to be able to adhere to the road surface. And an exhaust pipe of the engine is connected to the case.

According to this invention, when the road surface is cut, the blade is driven by the driving force from the engine via the driving force transmission means, and the blade is caused to enter the road surface by the lifting means in this state. By moving in this way, the road surface cutting process can be performed. At this time, since the cutting process can be performed in a state where the brush of the case is in close contact with the road surface, it is possible to reduce the sound generated from the blade accompanying the cutting process by the case. In addition, since the engine exhaust sound generated when the engine is driven is transmitted into the case via the exhaust pipe, it can be reduced similarly to the generated sound. In addition, even when dust is generated due to the cutting process, the case can prevent the dust from scattering, so that the burden of the cleaning process can be reduced and the engine can suck the dust. Can be prevented. Therefore, it is possible to prevent a decrease in the durability of the engine, thereby improving the reliability. Further, the case only needs to have a shape that can surround the blade, and since it is not necessary to make the outer shape coincide with the shape of the blade, versatility can be improved as compared with the conventional case.

The invention according to claim 2 is the invention according to claim 1 , wherein a silencer of the engine is interposed in the exhaust pipe outside the case connected between the engine and the case. And
According to the present invention, the exhaust sound from the engine can be transmitted to the silencer in the case via the exhaust pipe, so that the exhaust sound can be reduced by the silencer and the sound quality can be reduced. In addition, the volume can be reduced by the case. For this reason, the sound generated by the cutting process can be greatly reduced, and the comfort can be improved. Moreover, since the pressure in the case can be increased by the exhaust gas discharged from the silencer, the brush can be urged toward the outside of the case, and a sealing function during the cutting process can be secured. .

The invention according to claim 3 is the invention according to claim 1, wherein the engine silencer is mounted outside the case, and the engine exhaust pipe is connected to the silencer. And
According to the present invention, exhaust sound from the engine can be reduced by the silencer and sound quality can be reduced. Furthermore, since the exhaust pipe of the engine connected to the silencer is connected to the case, comfort can be improved and the sealing during the cutting process can be performed as in the invention according to claim 2. Function can be secured. In addition, the silencer can be attached more easily.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, the blade has a rotating shaft connected to the driving force transmitting means, and the blade is integrated with the rotating shaft. The case is formed with an opening that opens an area including a path for raising and lowering the rotary shaft, and covers the opening while allowing the rotary shaft to move up and down. A cover portion is provided.

  According to this invention, since the rotation shaft of the blade can be connected to the driving force transmission means outside the case from the opening of the case, the blade is rotated and moved up and down independently of the case. The cutting process can be performed while maintaining the sealed state by the case.

  The invention according to claim 5 is the invention according to any one of claims 1 to 4, wherein at least a pair of wheels, an axle connecting these wheels, and swingable with the axle as a fulcrum. A driving base of the engine, further comprising a movable base, wherein the engine is mounted on a base end side of the surface of the movable base, and a rotation shaft of the blade is rotatably connected to a front end side of the back surface of the movable base. And a rotating shaft of the blade are connected via the driving force transmitting means.

  According to this invention, the rotating shaft of the blade is rotatably connected to the back surface of the movable base, and is connected to the engine mounted on the surface of the movable base via the driving force transmission means. Since the repulsive force that the blade receives from the road surface during processing can be suppressed by the weight of the engine, the cutting process can be performed smoothly. In addition, since the engine is disposed on the base end side of the movable base and the rotating shaft is disposed on the distal end side of the movable base, the torque required for raising and lowering the rotating shaft can be reduced, and the compactness of the apparatus is achieved. Can be achieved.

The invention according to claim 6 is the one according to any one of claims 1 to 5, wherein a tank for storing the cooling medium, and a supply means for supplying the cooling medium in the tank into the case, Is further provided.
According to the present invention, since the cooling medium is supplied into the case via the supply means, the blade can be protected from the heating accompanying the cutting process, and the life can be extended. Further, heat transfer to the exhaust pipe connected to the case can be prevented, and further, when a silencer is mounted in the case, the temperature rise can be suppressed by the cooling medium. .

  According to the first aspect of the present invention, it is possible to reduce the sound generated from the blade and the engine exhaust sound accompanying the cutting process by the case. Further, even when dust is generated along with the cutting process, the burden of the cleaning process can be reduced, and the deterioration of the durability of the engine can be prevented, so that the reliability can be improved. Moreover, versatility can be improved compared with the past.

According to the invention concerning Claim 2 and Claim 3, the sound which generate | occur | produces by a cutting process can be reduced significantly, and comfort can be improved. Moreover, the sealing function at the time of a cutting process is securable.
According to a fourth aspect of the present invention, the blade can be rotated and moved up and down independently of the case, and a cutting process can be performed while maintaining a sealed state by the case.

According to the invention which concerns on Claim 5, it becomes possible to perform a cutting process smoothly. In addition, the torque required for raising and lowering the rotary shaft can be reduced, and the apparatus can be made compact.
According to the invention which concerns on Claim 6, the said blade can be protected from the heating accompanying a cutting process, and lifetime can be achieved. In addition, heat transfer to the exhaust pipe connected to the case can be prevented.

A road surface cutter in an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a side view of a road surface cutter according to a first embodiment of the present invention. 2 and 3 are a front view and a plan view of the road surface cutter shown in FIG.
As shown in these drawings, the road surface cutter 1 includes a flat fixed base 3. Front wheels 4 and 5 connected via an axle 8 are rotatably mounted on the fixed base 3 at the center on the front end side on the back surface. The axle 8 is formed shorter than the length of the fixed base 3 in the width direction (for example, the vertical direction in FIG. 3).

  On the other hand, the axle 9 that connects the rear wheels 6 and 7 is formed longer than the length of the fixed base 3 in the width direction. The axle 9 is disposed so as to be rotatable along the proximal end surface of the fixed base 3. The rear wheels 6 and 7 are attached to both ends of the axle 9 at positions outside the both side surfaces of the fixed base 3. Further, a case connecting frame 47 is interposed between the rear wheel 6 and the fixed base 3. The case connecting frame 47 is configured such that the base end side is rotatably connected to the axle 9 and the tip end side is connected to the case 30. Therefore, the case 30 can swing about the axle 9 as a swing fulcrum.

  A water tank 11 for storing cooling water as a cooling medium is disposed above the axle 9 between the rear wheels 6 and 7. An upper end portion of the water tank 11 is provided with a moving handle 10 for an operator that extends rearward from both sides. Details of the configuration relating to the water tank 11 will be described later.

  A base end portion of a movable base 16 is rotatably connected to the axle 9. Therefore, the movable base 16 can be swung on the upper side of the fixed base 3 with the axle 9 as a fulcrum. The movable base 16 is formed with a notch 18 (see FIG. 3) at the front end of the side surface on the case 30 side. Note that the fulcrum of the movable base 16 is not necessarily the axle 9, and the fulcrum may be provided on the fixed base 3.

An engine 17 as a drive source is mounted on the base end side of the surface of the movable base 16. A drive shaft 19 protrudes from the side surface of the engine 17 on the case 30 side. A pulley 20 formed on the same axis is integrally mounted on the outer peripheral side of the drive shaft 19.
On the other hand, on the back surface of the movable base 16, pillow blocks 25 and 26 are fixedly provided at positions facing the notch 18 in the width direction. These pillow blocks 25 and 26 hold the rotation shaft 24 so as to be rotatable over the width direction of the movable base 16.

A pulley 21 is integrally attached to a portion of the rotating shaft 24 that faces the pulley 20. A belt 22 is wound around these pulleys 20 and 21 via a notch 18. A blade 27 formed in a substantially disc shape is attached to the rotating shaft 24 on the outer peripheral side of the case side end so as to have the same axis.
Thereby, the driving force of the engine 17 can be transmitted to the blade 27 via the pulleys 20 and 21 and the belt 22, and the blade 27 can be rotated. Thus, the rotation shaft 24 has a function as a rotation axis of the blade 27 (hereinafter, referred to as “rotation axis 24” as appropriate).

  In the present embodiment, the height adjustment rod 41 and the engagement hole 42 are used as the lifting mechanism of the blade 27. The height adjusting rod 41 is erected so as to be pivotable upward from the central portion on the distal end side of the fixed base 3. On the other hand, the engagement hole 42 is formed in the center portion on the distal end side of the movable base 16 and the height adjusting rod 41 is inserted therein. The height adjustment rod 41 has a male screw and the engagement hole 42 has a female screw. The engagement hole 42 is screwed to the height adjustment rod 41, so that the distal end position of the movable base 16 is reached. The (swing angle) can be held at a predetermined position (predetermined angle). The engaging hole 42 is a long hole so that it can be screwed onto the height adjusting rod 41 even when the height position of the movable base 16 changes.

  Further, a height adjusting handle 40 for an operator is formed at the tip of the height adjusting rod 41. When the operator operates and rotates the adjustment handle 40, the height adjustment rod 41 rotates integrally, and the height position of the movable base 16 locked to the height adjustment rod 41 is adjusted. Can be adjusted.

  Since the rotary shaft 24 of the blade 27 is held on the back side of the movable base 16, the height position of the rotary shaft 24 and consequently the height position of the blade 27 are adjusted by adjusting the height position of the movable base 16. Can be adjusted. By performing this swinging operation, the blade 27 can enter and leave the road surface.

The blade 27 is surrounded by a case 30. The case 30 includes a main body portion 31 having an opening formed in the lower portion, and a brush 36 that extends downward from the main body portion 31 and can be brought into close contact with a road surface .
Wheels 37 and 38 are attached to the lower surface of the case 30 on the tip side, and the case 30 is rotatably supported by these wheels 37 and 38.

  The case 30 is formed with an opening 32 that opens a region including the up-and-down movement path of the rotating shaft 24. Covers 33 and 34 are provided so as to sandwich the rotary shaft 24 from outside the opening 32 (see FIG. 4). Thereby, the sealed state of the side surface of the case 30 is ensured while allowing the rotary shaft 24 to move up and down. Here, it is preferable that the covers 33 and 34 are provided not only on the outside of the case 30 but also on the inside thereof in that the sealing function and the soundproofing function can be further enhanced.

In the present embodiment, as shown in FIG. 5, the silencer 45 of the engine 17 is mounted inside the case 30, and the exhaust pipe 44 of the engine 17 is connected to the silencer 45 via the pipe hole 48 of the case 30. Connected to.
Moreover, as shown in the figure, the case 30 has the reflecting plate 13 mounted on the inner wall surface thereof at a predetermined interval. These reflectors 13 enhance the sound deadening function in the case 30. Further, a guide plate 14 for guiding the blade 27 is provided at a lower portion in the case 30 at a predetermined inclination angle.

  6 is a view taken in the direction of arrow AA in FIG. As shown in the figure, a slit 15 is formed in the guide plate 14, and the leading end side of the blade 27 can be inserted into the slit 15. As a result, the guide plate 14 can guide the blade 27 so that the blade 27 can move in a predetermined locus when the cutting process is performed. In the cutting process, since the blade 27 is inserted into the slit 15, the inside of the case 30 is partitioned up and down via the guide plate 14. Thereby, since the members such as the silencer 45 and the reflector 13 mounted on the upper side of the case 30 can be protected from dust generated by cutting, the cleaning operation in the case 30 can be simplified. Further, the silencing effect on the engine 17 can be enhanced.

  Here, it is preferable that the guide plate 14 is attached to an intermediate portion of the case 30 (a portion that divides the case 30 horizontally into upper and lower portions) in that a noise reduction effect can be enhanced for each of the engine 17 and the blade 27.

A water absorption pipe 12 is connected to the water tank 11 described above, and the water absorption pipe 12 supplies the blade 27 in the case 30 via a pipe hole 49 of the case 30.
This will be described with reference to FIG. FIG. 7 is a sectional view showing a cooling structure of the road surface cutter 1. As shown in the figure, the blade 27 is sandwiched between blade holders 52 and 53 at the center of both surfaces. The blade holders 52 and 53 are formed with substantially disc-shaped cooling water passage grooves 54 and 55 on the center side of the opposing surface of the blade 27, respectively. The water absorption pipe 12 is connected to the cooling water passage groove 54 of the blade holder 52.

  As shown in FIG. 8, a cooling water hole 29 is formed through the blade 27 around the rotation shaft hole 28. Thereby, the cooling water supplied to the cooling water passage groove 54 of the blade holder 52 can flow to the cooling water passage groove 55 of the blade holder 53 through the cooling water hole 29 of the blade 27. It becomes. And since cooling water is supplied to both surfaces of the braid | blade 27 from the peripheral side of each groove | channel 54, 55 for each cooling water channel | path, it can supply cooling water substantially uniformly over the whole surface of the braid | blade 27 rotationally driven. Yes.

  Needless to say, the cooling structure is not limited to that shown in FIG. For example, as shown in FIG. 9, the tip of the water absorption pipe 58 may be formed in a U-shaped cross section, and cooling water may be supplied to the blade 27 from the inner part of the tip.

The road surface cutter 1 configured as described above operates as follows.
When the road surface cutting process is performed, the driving force from the engine 17 is transmitted to the blade 27 via the pulleys 20 and 21 and the belt 22 to rotate the blade 27. In this state, when the operator operates the height adjustment handle 40 to change the engagement position between the height adjustment rod 41 and the engagement hole 42 downward, the movable base 16 can be rotated. The held blade 27 is moved so as to enter the road surface. Thereby, the cutting process of a road surface can be performed.

  At this time, the rotary shaft 24 rotatably held by the movable base 16 descends while drawing a substantially arc-shaped locus (see FIG. 4), but as described above, the case 30 is moved up and down. An opening 32 including a region including a movement path (substantially arcuate locus) is formed, and covers 33 and 34 are provided so as to cover the opening 32. For this reason, the rotating shaft 24 and the blade 27 can be lowered while maintaining the sealed state without being interfered with the case 30.

And when performing the cutting process of the road surface by the blade 27, the cutting process can be performed by bringing the brush 36 of the case 30 into close contact with the road surface, so that the sound generated from the blade 27 accompanying the cutting process is reduced by the case 30. be able to. In addition, since the exhaust sound of the engine 17 generated when the engine 17 is driven is transmitted into the case 30 via the exhaust pipe 44, it can be reduced similarly to the generated sound.

Moreover, the silencer 45 mounted in the case 30 can further reduce the exhaust sound and reduce the sound quality. Furthermore, since the pressure in the case 30 can be increased by the exhaust gas exhausted from the silencer 45, the brush 36 can be urged toward the outside of the case 30, and a sealing function during the cutting process can be ensured. it can. Here, since the brush 36 is used, the exhaust can be released to the outside while keeping the pressure in the case 30 at an appropriate pressure.

  Further, even when dust is generated due to the cutting process, the case 30 can prevent the dust from being scattered, so that the burden of the cleaning process can be reduced, and the dust is sucked into the engine 17. Can be prevented. Accordingly, a decrease in the durability of the engine 17 can be prevented, and the reliability can be improved.

  In addition, since the rotary shaft 24 of the blade 27 is pivotally connected to the back surface of the movable base 16 and connected to the engine 17 mounted on the surface of the movable base 16 via the pulleys 20, 21 and the belt 22, the road surface cutting process is performed. At this time, the repulsive force that the blade 27 receives from the road surface can be suppressed by its own weight. Therefore, the cutting process can be performed smoothly. In addition, since the engine 17 is disposed on the base end side of the movable base 16 and the rotating shaft 24 of the blade 27 is disposed on the distal end side of the movable base 16, the torque required to raise and lower the rotating shaft 24 can be reduced. The apparatus can be made compact.

Further, since the cooling water is supplied from the water tank 11 into the case 30 through the cooling water supply means such as the water absorption pipe 12, the blade 27 can be protected from the heating accompanying the cutting process, and the life is extended. be able to. Further, heat transfer to the exhaust pipe 44 connected to the case 30 can be prevented.
In this embodiment, since the silencer 45 is mounted in the case 30, the temperature rise of the silencer 45 can be suppressed by the cooling water.
Further, since the case 30 only needs to have a shape that can surround the blade 27, it is not necessary to make the outer shape coincide with the shape of the blade 27.

Hereinafter, another embodiment of the present invention will be described with reference to FIGS. Here, the same members as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted as appropriate.
FIG. 10 is a side view showing the road surface cutter 2 in the second embodiment of the present invention. In the present embodiment, the silencer 45 of the engine 17 is mounted outside the case 30, the exhaust pipe 46 of the engine 17 is connected to the silencer 45, and the exhaust pipe 46 is connected to the case 30. These points are different from the first embodiment. If it does in this way, in addition to the effect mentioned above, there exists an effect that the work of attaching silencer 45 can be performed more simply.

FIG. 11 is a side view showing a road surface cutter 50 according to the third embodiment of the present invention. In the present embodiment, the fixed base 51 extends in the horizontal direction from the tip of the water tank 11 so as to face the case 30 and the movable base 16.
The sealed case 30 is fixed so as to be suspended from the fixed base 51. Further, front wheels 57 and 58 are arranged below the support 56 provided at the tip of the fixed base 51. These points are different from the first embodiment. If it does in this way, the same effect can be produced with simple composition compared with the above-mentioned embodiment.

  FIG. 12 is a schematic side view showing a road surface cutter 60 according to the fourth embodiment of the present invention. In the present embodiment, the case connecting frame 61 is also rotatably connected to the axles 9 of the rear wheels 6 and 7, and the case 30 itself can swing about the axle 9 as a fulcrum. The form is different. In this case, when the road surface is inclined, the road surface cutting process can be performed in a state where the case 30 itself is swung and held at a predetermined angle, so that convenience is improved. it can.

  FIG. 13 is a schematic side view showing a road surface cutter 70 according to a fifth embodiment of the present invention. In the present embodiment, the case coupling frame 71 is fixed, but a swing fulcrum 72 is formed on the case 30 itself. An auxiliary wheel 73 is formed on the case 30. These points are different from the first embodiment. In this way, since the swing angle of the case 30 itself can be set large, convenience can be improved.

  FIG. 14 is a schematic side view showing a road surface cutter 80 according to a sixth embodiment of the present invention. In the present embodiment, a case coupling frame 81 is provided above, and a swing fulcrum 82 is provided above the case 30. An auxiliary wheel 83 is provided on the lower surface of the case 30. These points are different from the first embodiment. In this way, since the swing angle of the case 30 itself can be set large, convenience can be improved.

  The contents of the present invention are not limited to the above-described embodiments. For example, in the embodiment, the description has been given of the hand-held road surface cutter, but it may be applied to a self-propelled road surface cutter. Further, the present invention may be applied when the road surface is cut into a circular shape, or may be applied when the road surface is cut into a rectangular shape or other shapes. Further, the power transmission means of the engine is not limited to a belt or a pulley, and for example, a chain and a sprocket may be used. Further, the rotational direction of the engine drive shaft and blades may be clockwise or counterclockwise, and in any case, the present invention can be applied.

It is a side view which shows the cutter for road surfaces in the 1st Embodiment of this invention. It is a front view which shows the cutter for road surfaces of FIG. It is a top view which shows the cutter for road surfaces of FIG. It is explanatory drawing which shows the rocking | fluctuation operation | movement of the road surface cutter shown in FIG. It is sectional drawing which shows the structure in the case of the cutter for road surfaces of FIG. It is AA arrow line view of FIG. It is sectional drawing which shows the cooling structure of the cutter for road surfaces of FIG. FIG. 2 is a schematic front view of the blade shown in FIG. 1. It is explanatory drawing which shows the modification of the cooling structure of the road surface cutter shown in FIG. It is a side view which shows the cutter for road surfaces in the 2nd Embodiment of this invention. It is a side view which shows the cutter for road surfaces in the 3rd Embodiment of this invention. It is a schematic side view which shows the cutter for road surfaces in the 4th Embodiment of this invention. It is a schematic side view which shows the cutter for road surfaces in the 5th Embodiment of this invention. It is a schematic side view which shows the cutter for road surfaces in the 6th Embodiment of this invention.

Explanation of symbols

1, 50, 60, 70, 80 Road surface cutter 11 Water tank 12 Water absorption pipe 16 Movable base 17 Engine 20, 21 Pulley (driving force transmission means)
22 Belt (drive force transmission means)
24 Blade rotation axis (rotating shaft)
27 Blade 30 Case 31 Case body (main body)
32 Rotating shaft openings 33, 34 Rotating shaft cover (cover portion)
36 brush 41 height adjustment rod (lifting means)
42 engaging hole (lifting means)
44, 46 Exhaust pipe
45 Silencer

Claims (6)

A blade capable of cutting the road surface;
The engine that is the drive source,
Driving force transmitting means for transmitting the driving force of the engine to the blade;
Elevating means for moving the blade so as to enter and leave the road surface;
A case surrounding the blade,
The case has a main body part having an opening formed at the bottom, and a brush that extends downward from the main body part to be able to adhere to the road surface,
A road surface cutter comprising an exhaust pipe of the engine connected to the case.   2. The road surface cutter according to claim 1, wherein a silencer for the engine is mounted inside the case, and an exhaust pipe for the engine is connected to the silencer. The road surface cutter according to claim 1 , wherein a silencer of the engine is interposed in the exhaust pipe outside the case connected between the engine and the case . Connecting the rotating shaft of the blade to the driving force transmitting means, and allowing the blade to rotate integrally with the rotating shaft and move up and down;
The case is provided with an opening that opens an area including a path for moving the rotary shaft up and down, and a cover that covers the opening while allowing the rotary shaft to move up and down. The road surface cutter according to any one of claims 1 to 3. Further comprising at least a pair of wheels, an axle connecting these wheels, and a movable base swingable with the axle as a fulcrum;
While mounting the engine on the base end side of the movable base surface,
The rotation axis of the blade is connected to the tip side of the back surface of the movable base so as to be rotatable,
5. The road surface cutter according to claim 1, wherein the driving shaft of the engine and the rotating shaft of the blade are connected via the driving force transmitting means. A tank for storing a cooling medium;
The road surface cutter according to any one of claims 1 to 5, further comprising supply means for supplying a cooling medium in the tank into the case.

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